US2785991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of red oxide of iron
Assignee: C K Williams & Co
•
Filing: 1952-09-16
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Granted: 1957-03-19
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Expires: 1972-09-16
Abstract
No abstract record available.
Inventors
- 👤 Leonard M Bennetch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:10
CPC Classifications
C; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/62; C01P2006/00; C01P2006/60; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2127907A
Cited
US1327061A
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US1368748A
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DE492945C
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US2388659A
Cited
US2558303A
Cited
US2558304A
Cited
GB653358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |